The crash, in which Grosjean plunged into the barriers at high speed in the first lap and his car exploded into flames and split in two, led to a lengthy red flag period.
Ferrari, will invest heavily in bouncing back while Red Bull, who have been closest to matching Mercedes, seek more consistency and speed to close the gap
Taking full advantage of team-mate and pole-sitter Valtteri Bottas' early retirement with engine problems, Hamilton drove a well-judged race to claim his seventh victory from 11 contests this year